Patent GB-430745-A (GB)
Abstract: 430,745. Calculating-machines. GUSTAFSSON, E. V., 95B, Regeringsgatan, Stockholm, and HELLGREN, G. H., 14B, Kaptensgatan, Malm÷, both in Sweden. Nov. 21, 1933, No. 32535. Convention date, Nov. 22, 1932. [Class 106 (i)] A calculating-machine of the ten-key type for the four rules has longitudinally stationary registers and means whereby, in multiplication, the multiplies and the multiplier are set in succession on the same set of keys. Addition. The depression of a numeral key 35 rocks a lever 30 pivoted at 31 and having a hammer end 32 which pushes out a stop 8 in a travelling selector 11. A bar 36 underlies all the levers 30 and is carried by a lever 37 pivoted at 31 and acting on ratchet mechanism 220 to control the step-by-step movement of the selector. The stops have item indications on their ends and when protruded are supported by slots in a plate 8b. When the complete item has been set a startng key 93, Fig. 3, is depressed. The key is connected at 91 to a lever 89 pivoted at 90 and carrying a hook 52 which can engage a pawl 48 pivoted at 50. The pawl 48 is thus removed from teeth on a sector 45 secured to a shaft 42, the sector moving one step until arrested by the contact of an arm 44b with a projection 43b on the lever 89. The sector 45 carries a stud 46 against which bears a lever 41, 97 which is rocked clockwise upon the movement of the sector, the lever arm 97 rocking a three-armed lever 101, 102, 103 anticlockwise. The arm 103 closes a motor switch 107, and releases a pawl 112 which thereupon couples a driving member 118 to a driven member 58. The arm 102 engages in a comb 23 secured to the selector. Towards the end of one revolution of the member 58 a roller 59 rocks a lever 56 pivotally carrying a restoring pawl 61 which returns the sector 45 to its initial position. The starting key 93 is held depressed by a rib 40 on the lever 41 engaging over a projection 38b on the lever 89, the rib at the same time preventing the depression of the numeral keys by standing beneath similar projections 38, Fig. 1, on their levers 30. When the sector 45 is restored the stud 46 rocks the lever 41, 97 anticlockwise whereby the contacts 107 are opened and the pawl 112 engaged to break the driving connection at the end of one revolution. Feelers 7, Fig. 4, on sectors 2 are moved, (until arrested by the set stops in the selector), when a rod 4 is lifted by a link 184 actuated from the main shaft 114, the sectors being actuated by springs 3 tensioned by the rocking of levers 3<c> pivoted at 6 and also moved by the link 184. The totalizer pinions 9 are moved into engagement with the sectors 2 during the return movement of the latter by the rocking of arms 193 pivoted at 192 and controlled by a cam 187 on the main shaft. Subtraction. To effect subtraction the totalizer frame 197 is rocked by means not shown to bring pinions 10 into engagement with the sectors 2. Multiplication. The multiplicand is first set in the selector in the same manner as in addition. The multiplication key 88 is then depressed and if the multiplicand is to be multiplied by five the " 5 " key 35 is depressed. The multiplication key 88 rocks a lever 79 pivoted at 82 whereby a spring 72 can rock clockwise a lever 68 pivoted at 69 and carrying a link 75 having a slot 76 embracing a pin 77 on the lever 37 secured to the bar 36 underlying the numeral key levers 30. The key 88 is held depressed by detent means 84, 85, 86. When the " 5 " key 35 is depressed the bar 36 and pin 77 rock the link 74 so that a finger 66 thereon turns the pawl 48 out of engagement with the sector 45 which is then rocked by its spring 47 on angle equivalent to five steps, this differential movement being determined by one of a series of arms 44, Fig. 1, secured to the shaft 42, striking a stop 43 on the depressed key lever 30. The removal of the stud 46 from the lever 41 causes the closing of the motor circuit at 107 and effects the engagement of the clutch 118 as in an adding operation, but the main shaft now makes five revolutions, the sector 45 being stepped back one step at each revolution until finally the stud 46 rocks the lever 41 to stop the machine. The numeral key 35, which has been held depressed by a rib 40 on the lever 41, is thus released. When the numeral key is depressed the lever 37 releases the escapement mechanism 220 but the selector is held from movement by the lever arm 102 which has entered the comb 23. At the end of the actuation the lever arm is withdrawn and the selector stepped one step to the left, so that if another numeral key e.g. " 3 " is now depressed the main shaft makes three rotations and the amount on the selector is transmitted to the totalizer the equivalent of thirty times. The depression of the multiplication key also rocks, through a link 181, Fig. 4, a shaft 176 to which is slidably keyed a frame 303. The frame is thus coupled to the selector, since a fin 395 engages a comb 179 on the selector. A bar 304<a> on the frame is thereby brought into position to engage notches 7a on the feelers 7, and as the selector is stepped along the movement of the feelers below the lowest significant multiplicand place in the selector is prevented. If the " O " key 35a, Fig. 4, is actuated while the multiplication key is also depressed, a projection 71 on the " O " key stem rocks the lever 68 to remove the finger 66 from the pawl 48 so that the sector 45 is not released and no actuation of the main shaft occurs, the selector being, however, moved one step to the left. In multiplication, stops corresponding to the digits of the multiplier are set up in the selector to the right of the multiplicand and merely serve to indicate the multiplier. Multiplier and quotient register. The numeral wheels 145, Fig. 10, of this register are driven by intergeared pinions 144, 146 actuated by a member 142, 143. The register is advanced by one step at each operation of the machine, the advance being made in that denomination in which a coupler 171, connected to the frame 303, is situated. During multiplication, this frame is coupled to the selector 11 to be stepped along therewith, whereby at the end of the calculation the register 145 indicates the multiplier. At the beginning of each operation, a cam 131 on the main shaft rocks a lever 135 anti-clockwise so that a link 137 engaging a pin 311 on a bridge 138 pivoted at 139 rocks the bridge to push the nose 143 of the actuator into engagement with the pinion 146 and to remove the nose 142 from the pinion 145. The actuator is pivoted at 151 to a lever 149 pivoted at 152 to an arm 153 pivoted at 154. A shaft 6 now rocks clockwise and through a link 166 draws down a shaft 164 carried by arms pivoted at 162. The coupler 171 is also depressed and displaces a member 157 so that the said member rests with its notch 170 on a fixed rail 169. During the descent, due to spring action, of the member 157, the arm 153 connected to the actuator 142, 143, is lowered, the member 157 being pivoted to the arm 153 at 156. The nose 143 thus rotates the pinion 146 half a step in a clockwise direction. The cam 131 now moves the actuator 142, 143 into the position shown in Fig. 10, the shaft 6 then rocks anticlockwise and returns the other parts to the positions shown, the nose 142 engaging the pinion 144 and completing the actuation of the register, which has thus been advanced by one complete step in that denomination selected by the coupler 171. Subtractive operation of multiplier and quotients register. A link 204<a> raises the link 137 so that the latter link engages a pin 310 on the bridge 138. When the lever 135 swings anticlockwise the nose 142 remains in contact with the pinion 144 during the downward movement of the member 157 and the nose 143 actuates the pinion 146 during the upward movement. The direction of rotation of the register wheel is thus reversed. Transfer mechanism. A cam 159 on the pinion 146 rocks an arm 158 of the next higher member 157, this member being thus displaced and drawn down by its spring to cause a half-step to be given to the wheel 146. The member is then restored by the rod 164 to complete the actuation of the register. Division. This is effected by repeated subtraction initiated by depressing a key which rocks the lever 102. The operation is interrupted, by means not described, when the highest order totalizer wheel passes through zero in the subtractive direction.